Alarm system



April 6, 1937. H. 151l M|| ER 2,075,822

ALARM SYSTEM Filed June 22, 1931v 9 Sheets-Sheet l 27 2S 4 7...- .F-tCfl f ss l 2G @Y 37 64 l so` L s@ 4G n 62" 6T 3o B l] 4e "G l @je 47 sawww E s2 Fica-3 s4- c 30' #-65 @s l: J 5g 5'? J ,13 5S sa 65 5s n i ff11 2;

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Invent-or: /g rf S9 HaroLd B. Millen -IIIII IIIIIIIIPL www t g 'ttornegsApril 6, 1937.

H. B. MILLER ALARM SYSTEM Filed June 22, 1931 9 Sheets-Sheet 2/f'torheggb April 6, 1937. H, B. MILLEF; 2,075,822

ALARM SYSTEM Filed June 22, 1951 9 sheets-sheet s Irvenl'or: Har-old B.Mallerm 'M/tfornegs.

April 6, 1937. l H. B. MILLER 2,075,822

ALARM SYSTEM f 9 Sheets-Sheet 4 Filed June 22, 1951 IIIIIIMIZIIUIIIIIIIIInventor'. Harold B. Miller.

April 6, 1937.

Filed June 22, 1931 9 Sheets-Sheet 5 8 2 2 1H. 1I.. 1M E A@ Q C 8 n llelm lllllll ||9 lm ||e |16 iel|||||lllll|||Illlellllll|||l|wlIIIIIIIIIIIPIIIIIIIIIIIP|||||||||||||||l||||||el| AHIHL f 2 2 `1i q." )r Inventor:

v Har-old. B.Mille,r`.

fior-megs.

'Ficar April 6, 1937. H. B. MILLER ALARM SYSTEM Filed June 22, 1931 9Sheets-Sheet 6 Cremas:

H. B. MILLER ALARM SYSTEM April 6, 1937.

9 Sheets-Sheet 7 Filed June 22, 1951 H. B. MILLER April 6, 1937.

ALARM SYSTEM '9 sheets-sheet a Filed June 22, 1951 nven or-z Holrcld B.Miller. 5?@ t ornegs.

April 6, 1937.

H. B.MILLER ALARM SYSTEM Filed Junev 22, 1931 Fig-Z0.

9 Sheets-Sheet 9 ULL 1ML JML @CID Harold B. Mi ller? Patented Apr. 6,1937 otu'riao STATES PATENT 'ortica 2,075,822 ALARM SYSTEM Harold B.Miller,

Application June 22,

7 Claims.

This invention relates to an alarm system adapted to be employed eitheras a single alarm system consisting of one alarm producing unit, or as a`multiple alarm system consisting of a plurality of alarm producingunits.

An object of the invention is to provide an alarm system wherein eachalarm of the system will be caused to function or operate either when aline wire of the system becomes broken, or

1o when a line wire of said system becomes grounded.

A further object is to provide an alarm system which can include one ormore alarm producing units each of novel and improved con- K struction,and each adapted to be restored to i5 normal position, after actuationthereof, in novel and vimproved manner.

And a still further object is to provide an alarm system consisting ofindividual alarm producing units a plurality of which can be associatedand combined with each other in novel and improved manner to provide amultiple alarm system of novel and improved construction.

With the above objects in View, as well as others which will appear asthe specication proceeds, the invention comprises the construction,arrangement and combination of parts as now to be fully described and ashereinafter to be specically claimed, it being understood that thedisclosure herein is merely illustrative and intended in no way in alimiting sense, changes in details of construction and arrangement ofparts being permissible as long as within the spirit of the inventionand the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. 1 is a diagrammatic view of an alarm system made according to thepresent invention and including .a single alarm producing unit, all ofthe elements of said single alarm producing unit being shown in normalpositions, ready to be operated to make an alarm discernible;

Fig. 2 is a similar view showing a switch of the unit as having beenmoved to open position to cause the alarms of vthe unit to operate;

Figs. 2a and 2b are views disclosing connecting line wires of the unitbroken, with the same result as in Fig. 2;

Fig. 3 is a View showing line wires as in Figs. 2a and 2byinterconnected, to have no resultant effect upon a unit as in Fig. l;

Fig. 4 is a view similar to Figs. 1 and 2, but showing the parts of theunit positioned as when one or more line wires are grounded, or as whenMinneapolis, Minn.

1931, Serial N0. 545,881

the actuating switch has been restored to closed position;

Fig. la is a view disclosing a grounded line wire for producing theresult as in Fig. 4;

Fig. 5 is a View similar to Fig. l, but showing the unit as when beingreset to normal position Fig. Bris a diagrammatic view of an alarmsystem made according to they invention and including a plurality ofalarm producing units all shown vin normal positions, each ready to beoperated to make an alarm discernible;

Fig. 'l is a View similar to Fig. 6, showing a switch of one of theunits as having been moved to open position to cause the alarms of oneof the units to operate;

Fig. 8 is a side elevational View of a cabinet for housing a pluralityof alarm'producing units of a multiple alarm system made according tothe invention;

Fig. 9 is a rear elevational View of the cabinet of Fig. 8;

' Fig. 10 is a fronty elevational view of said cablnet of Fig. 8;`

Fig. 11 is an enlarged fragmentary vertical sectional View of theforward wall or panel of said cabinet of Fig. 8;

Fig. 12 is a horizontal sectional View, on a reduced scale, taken as online l2-I2 in Fig. 11;

Fig. 13 is a detail sectional view disclosing the relays of any one ofthe alarm producing units of the invention, the present view alsodisclosing one of the fuses;

Fig. 14 is a sectional view of the upper relay of Fig. 13, taken on linelt-Il in said Fig.- 13;

Fig. 15 is a sectional view of the middle relay of Fig. 13, taken online l5l5 'in said Fig. 13;

Fig. 16 is a sectional view of the lower relay of Fig. 13, taken on linel6-l6 in said Fig. 13;

Fig. 17 is a sectional View of said lower relay of Fig. 13, taken online I'l-ll in said Fig. 13;

Fig. 18 is an elevational view of a fragment of the fuse panel;

Fig. 19 is a detail sectional View of a portion of the cabinet of Fig.8, showing certain of the relay housings in elevation, and others ofsaid relay housings in section;

l Fig. 20 is a detail sectional View taken as on line 20-20 in Fig. 19;

Fig. 21 is a fragmentary sectional view of a supervisors cabinet; andYFig. 22 is a fragmentary sectional View o1' a support for an alarmactuating mechanism, in spaced relation tothe alarm designatingmechanism, the present view disclosing said alarm actuating mechanism inelevation.

In Figs. l, 2, 2a, 2b, 3, 4, 4a, and 5 of the drawings an alarm systemconsisting of a single unit for kproducing or designating an alarm froma single station is disclosed, said unit including relays which may, forconvenience, be termed relays A, B and C, respectively.

The relay A consists of a magnet 25 having a pivoted armature 26 whichconstitutes a movable switch arm of a switch including a fixed contact21. The relay B consists of a magnet 28 having a pivoted armature 29which constitutes a movable switch arm of a switch including a xedcontact 39. The relay C consists oi a magnet 3| having a pivotedarmature 32 at one of its ends which constitutes a movable switch arm ofa switch including a xed contact 33, and having at its other end apivoted armature 34 which constitutes a movable switch arm of a switchincluding a fixed contact 35.

The unit, as disclosed, also includes alarm sigrial lamps 36, an alarmsignal gong 31, a trouble and restorer lamp 38, a trouble and restorergong 39,\a fuse alarm lamp 46, and a fuse alarm gong 4|.

A suitable battery for the alarm producing or designating mechanism ofthe unit is indicated 42, and an alarm actuating switch, in spacedrelation to the alarm producing or designating mechanism, is represented43.

At the location of the alarm actuating switch, which switch is situatedat a place to be protected, a variable resistance 44 is inserted in thecircuit and positioned in a suitable locked box. One side of thisresistance 44 is connected as at 45 to ground in series with the switch43. The other side of the variable resistance 44 is desirably connectedto lead wires 46 and 41 from the alarm designating mechanism of theunit, said wires 46 and 41 being connected with each other preferably bya iixed resistance 48 of predetermined value which xed resistance isdesirably positioned in the locked box with the variable resistance 44and is connected at its mid point by a lead wire 49 to said variableresistance 44. When the switch 43 is located at some considerabledistance from the alarm designating mechanism, the fixed resistance 48may be omitted. The lead wires 46 and 41 join a lead wire 50 attached tothe magnet 25. In certain instances, said lead wires 46 and 41 may be asingle lead wire.

The alarm designating mechanism incorporates a plurality of switcheswhich include a movable Contact 5|, a fixed contact 52, a xed contact53, a movable contact 54 and a xed contact 55.

Following is a description of the remainder of the-wiring of the unit: Alead wire 56 extends from the minus side of the battery to the lamps 36and the gong 31, and a lead wire 51 extends from said lamps 36 and saidgong 31 to the switch arm 34. A lead wire 56 extends from the xedcontact 35 to the xed contact 53, and a lead wire 59 extends from themovable contact 54 to the plus side of the battery. Said lead wire 56 isgrounded at 60.

A lead wire 6| attached to the lead wire 56 eX- tends to the magnet 29,and a lead wire 62 connects the magnet 28 with the magnet 25. A leadwire 63 extends from the lead wire 56 to the magnet 3|, a lead wire 64extends from said maginet 3| to the switch arm 26, and a lead wire 65extends from the fixed contact 21 to the lead Wire 59. A lead wire 66extends from the lead wire 64 to the switch arm 29, and a lead wire-61extends from the fixed contact 36 to the lead wire 65.

A lead wire 68 extends from the lead wire 64 to the switch arm 32, alead wire 69 extends from the xed contact 33 to the movable contact 5|,and a lead wire extends from the fixed contact 52 to the lead wire 59.

A lead wire 1| extends from the lead wire 56 to the lamp 38 and the gong39, and a lead wire 12 extends from said lamp 38 and gong 39 to thefixed contact 55. The lead Wire 56 includes a fuse 13, a lead wire 14extends from location adjacent said fuse to the lamp 40 and the gong 4|,and a lead wire extends from said lamp 40 and gong 4| to the lead wire59.

As shown in Fig. 1 all of the parts of the alarm producing unit are innormal position, the various alarms of the unit being set to be operatedupon the breaking of either or both of the line wires 46, 41 of the unitor upon the grounding of either or both of said line wires or of asingle line vwire substituted therefor. It will be understood that thealarm designating mechanism will, in practice, be safely incorporated ina housing or container therefor at the location where the alarm is to bediscernible, and the alarm actuating mechanism will also be suitablyhoused at the location from which the alarm is to be sent. Naturally,the line wire or line wires between the alarm actuating mechanism andthe alarm receiving or designating mechanism must be accessible.

The magnet of the relay A is, as shown in Figure l, normally included ina circuit leading from the battery 42 through the lead Wire 56, the leadwire 6|, the magnet 28, the lead wire 62, said magnet 25, the lead wire5D, the lead Wires 46 and 41 or a single lead wire substituted therefor,the xed resistance 48, the lead wire 49, the variable resistance 44, thelead wire 45, and the switch 43 to ground.

When the unit is installed, the variable resistance 44 is adjusted untila predetermined current flow is recorded on a test meter. 'I'his currentow is sufiicient to energize the magnet 25 to cause it to attract itsarmature 26 to thus hold the members 26 and 21 apart, but isinsuiiicient to energize the magnet 28 to cause this magnet to attractits armature 29. Thus, the members 29 and 39 will normally remain apart,as will also the members 32 and 33, and the members 34 and 35. That isto say, the relay B is so adjusted or constructed that it will notoperate on the current ilow that is required to operate the relay A.Thus, the relay B remains in normal position as shown in Fig. l at alltimes except when either or both ci the line wires 46 and 41 or a singleline wire substituted therefor become grounded to cause the line to haveless resistance than that in the normal circuit through the magnets 28and 25. Grounding of a line wire 46 or 41, or both, causes the magnet 26to be energized suiciently to attract its armature 29 and close thecircuit at 30. When the members 29 and 36 come into engagement, themagnet 3| is energized, the circuit through said magnet 3| being tracedfrom the battery 42, through the lead wire 56 and the lead wire 63 tosaid magnet 3|, thence through the lead wire 64 to the lead wire 66,thence through said lead wire 66 and the members 29 and 30 to the leadwire 61, and thence through said lead Wire 61, the lead wire 65 and thelead Wire 59 back to the battery. In Fig. 4a the line wire 41 is showngrounded, and in Fig, 4 the armature of the relay B is shown, in dottedlines, attracted by the magnet 23 to make the circuit through the relayC, the magnet 3l of which has also attracted its armatures.

Upon the breaking of the circuit through the relay A, as by manipulation.of the switch 43 to open position shown in Fig. 2, or by breaking ofboth of the lead wires 46 and 41 shown in Fig. 2b or a single lead wiresubstituted therefor, the armature 26 is released from the magnet 25 andis caused to engage the iixed contact 21, it being understood that aspring (not shown) is attached to each of thearmatures 25, 29, 32 and 34to vresiliently urge said armatures away from their magnets. Upon thebreaking of either of the lead Wires 46 or 41, as shown in Fig. 2a, thenormal current flow through the magnet 25, as well as through the magnet28, is reduced by half on account of the increased resistance'due to-the fact that only one lead Wire, 46 or 41 as the case may be, remainsto carry the current through said magnet 25. Such condition, by virtueof the initial adjustment of the` magnet Z5 of the relay A to suit theelectric currents employed in the system, causes the armature 26 to bereleased from said magnet 25 and to engage the iixed contact 21 in thesame manner as when the circuit through the magnet 25 is completelybroken.. Engagement of the members 26 and 21 with each other completes acircuit through the magnet 3|, said circuit being traced from thebattery 42 through the lead wire 56 and the lead wire 63 to said magnet3|, thence through the lead Wire 64 and the members 26 and 21 to thelead Wire 65, and thence through the lead Wire 65 and the lead wire 59back to the battery. V

Energization of the magnet 3|, either by engagement of the members 26and 21 or the members 29 and 36 With each other, causes the armatures 32and 34 to be attracted. The armature 32 when attracted engages the fixedcontact 33, and the armature 34 When attracted engages the xed contact35.

When the members 34 and 35 are in engagement, a circuit is completedthrough the alarm signal lamps 36 and the alarm signal gong 31, saidcircuit being traced from the battery 42 through the lead Wire 56 tosaid signal lamps r and said signal gong, thence through the lead Wire51 and said members 34 and 35 to the lead wire 58, and thence throughthe lead wire 53, the fixed contact 53, the movable contact 54, and thelead Wire 59 back to the battery. Thus, Whenever the magnet 3| isenergized, the signals 36 and 31 are made discernible. It'will beobvious that the magnet 3| will be energized either when a line wire ofthe system becomes broken, or when a line wire of said system becomesgrounded.

The magnet 3| will, naturally, when once energized, remain energized aslong as themovable Contact 5| and the iixed contact 52 remain inengagement, a holding 'circuit'for said mage net 3| being traced fromthe battery 42 through the lead wires 56 an-d 63 to said magnet 3|,thence through the lead wires 64 and 68 to the member 32, thence throughthe members 32 and 33 and the lead wire 69` to said members 5| and 52,and thence through the lead wires 16 and 59 back to the battery.

The contacts 5|, 52, 53, 54 and 55 together constitute a unit adapted tobe manipulated from the position as disclosed in Figs. l, 2 and 4 to theposition as disclosed in Fig. 5 to cause the contacts 5| and 52 to bedisengaged, the contacts 53 and 54 to be disengaged, and the contacts 54and 55 to be engaged.

Upon the separation of the contacts 5| and 52, the holding circuitthrough the magnet 3| is broken. If at this` time the nornnal circuitsthrough therelays A and B are restored to cause the members 26, 21 and26, 36 to be separated, the circuit through said magnet 3| will bebroken, and the armatures 32 and 34 will move from their positions as inFig. 4 to their positions as in Fig. 5. Upon the separating of thecontacts 53 and 54, the circuit through the signais 36 and 31 becomesbroken, as Will be evident, said vcircuit including said contacts 53 andUpon the engagement of the contacts 54 and 55 with each other, a circuitwill be completed through the trouble and restorer signals 38 and 53,said circuit being traced from the battery 422 through the lea-d wire 56and the lead wire 1l. to said trouble and restorer signals, thencethrough the lead Wire 12 and said contacts 55 and 54 tothe lead Wire 56,and thence through the lead wire 56 back to the battery, Thus, thetrouble and restorer signals 38 and 39 will be made discernible, andwill remain discernible, as long as the contacts 54 and 55 are inengagement.

It will be apparent that upon restoration of the contacts 5|, 52, 53, 54and 55 as in Fig.'5. back to their normal positions as in Fig. l, thetrouble and restorer signals will be made non-discernible, and the alarmsignals 35 and 31 will remain non-discernible, provided the relays A, Band C are normally positioned. Should there, however, at this time, be aline Wire of the system either broken or grounded, said alarm signalswill, obvously, become again discernible. In short, when there is acondition other than normal of the system, either the signals 36 and 31or the signals 33 and 36 will remain discernible, depending upon thepositions of the contacts 5| to 55, inclusive. l

The construction of the fuse 13 is such that upon the breaking of thisfuse a circuit is cornpletedthrough the fuse alarm signals 46 and 4|,said circuit being traced from the battery 42 through the lead Wire 56,the fuse 13, andthe lead wire 14 to said fuse alarm signals, and thencethrough the lead Wire 15 and the lead wire 59 back to the battery.Hence, the fuse signals will be discernible until a broken fuse isreplaced.

Attention is called to the fact that the phenomenon which can cause thepresent alarm to function or operate may be either a broken line wireconnection, or a grounded connection to either or both sides of theline, or a broken connection due to the destruction of 'an elementinserted in a line of the system and intended to be destroyed by meltingor otherwise, or a broken connection made by actuation ofl athermostatic element, or by an operated switch Connection iny thesystem;in fact, the present system will be operative to make a discerniblesignal whenever any condition'occurs in the system to alter or break thecircuit through the relay A, or

increase the Value of the circuit through the relay B.

In Fig. 3, linewires 46 and 41 are disclosed interconnected by a leadWire 16. Attention is called to the fact that such an interconnectedlead wire will not in any manner aiTect the operation of the system, forthe reason that the cross lead wire, such as 15, between line wires 46and 41, will not in any manner affect the circuit through either of therelays A or iB. As before stated, the line Wires 46 and 41 may incertain instances be a single line Wire.

vIn practice, the switch 43 will ordinarily return to closed positionimmediately after it is actuated to break the circuit through the relayA, so that when the unit including the contacts 5| to 55, inclusive, isactuated from the position as in Figs. 1, 2 and 4 to the position as inFig. 5 and then back to the position as in Figs. 1, 2 and 4, the systemwill be set at normal, provided neither the line wire 46 nor the linewire 41 is broken or grounded. Should a line wire 46 or 41 be broken orgrounded, the unit including the contacts 5| to 55, inclusive, will bemanually returned to the position as in Fig. 5, and the trouble andrestorer signals 38 and 39 will remain discernible until the system isplaced in order, unless a switch in the line, say, in the wire 12, isactuated to open position.

It need not be remarked that the variable resistance 44, the fixedresistance 48, and the magnets 25 and 28 will be constructed or adjustedto bear relation to each other suitable to the operation of theparticular unit in which these mentioned parts are incorporated. That isto say, in any installation, the values of all of the variableresistance 44, xed resistance 48, and magnets 25 and 28 bear definiterelation to each other.

In Figs. 6 to 22, inclusive, of the drawings, an alarm system consistingof a plurality of units for producing or designating an alarm from aplurality of different stations is disclosed, each of the units of themultiple alarm system including relays A, B and C, and also includingall of the other elements as set forth in connection with Figs. 1, 2, 4and 5.

Additionally, the multiple alarm system, incorporating units as alreadyset forth, includes mechanisms which will be hereinafter described.

The multiple alarm system includes a panel board which receives allalarms at a central point. The diierent alarms can originate at anyvariable distances from said panel board, each alarm producing unit, asalready described, being constructed and adjusted to suit theconditions.

When employing the alarm system of the invention as a multiple alarmsystem, a single line wire or pair of line wires must lead from eachlocation to be protected to the panel board, as will be evident.

It is well known that in. the distribution of telephone wiring, thevarious branches or eX- changes located in different sections of acommunity are connected together by cables each containing amultiplicity of wires which terminate on racks in said branches orexchanges. Obviously, the wire distribution in a multiple alarm systemincorporating the features of the present invention can follow the sameprinciple as the telephone wiring system.

Referring to the disclosure of the invention as made in Figs. 6 to 22 ofthe drawings, the relay A of each of the different alarm producing unitsconsists of a magnet 11 having a pivoted armature 18 which constitutes amovable switch arm of a switch including a fixed contact 19. The relay Bof each of the units of the multiple alarm system consists of a magnet90 having a pivoted armature 8| which constitutes a movable switch armof a switch including a xed Contact 82. The relay C of each unit of themultiple alarm system consists of a magnet 83 having a pivoted armature84 at one of its ends which constitutes a movable switch arm of a switchincluding a fixed contact 85, and having at its other end a compoundpivoted armature including bars 86 and 81 which constitute movableswitch arms of switches including xed contacts designated 88 and 89,respectively.

Each unit of the multiple system as disclosed also includes alarm signallamps 90, and a trouble and restorer lamp 9|.

A suitable battery, or batteries, for the alarm producing or designatingmechanisms of all of the units, is indicated 92, and an alarm actuatingswitch, or switches, one or more for each unit, in spaced relation tothe alarm producing or designating mechanism of the unit, is designated93.

'Ihe battery or batteries employed will be any battery or batteriessuitable to the purpose, and may desirably be kept charged by anautomati charging circuit (not shown).

At the location of each alarm actuating switch, a variable resistance 94is inserted in the circuit and positioned in a suitable locked box inthe manner as hereinbefore set forth. One side of each resistance 94 isconnected as at 95 to ground Y in series with a corresponding switch 93.The other side of each variable resistance 94 is con.- nected to leadwires 9B and 91 from the alarm designating mechanism of thecorresponding unit, said wires 96 and 91 being connected with each otherby a fixed resistance 98, or directly connected as the case may be,which xed resistance when employed may be of about the construction ofthe fixed resistance 44 already set forth, may be positioned in thelocked box with the corresponding variable resistance 94, and may beconnected at its mid point by a lead wire 99 to said variable resistance94. Where no xed resistance is employed, the lead wire 99 is jointed tothe lead Wires 96 and 91 at location where these meet each other. Seethe left hand side of each of Figs. 6 and 7. As hereinbefore mentioned,the fixed resistance 98 may be omitted in a case where the switch 93 islocated at some considerable distance from its corresponding alarmdesignating mechanism. The lead wires 96 and 91 of each unit join a leadWire |00 attached to the magnet 11 of said unit. Said lead wires 96 and91 may in some instances be replaced by a single lead wire.

The alarm designating mechanism of each of the individual units of themultiple alarm system incorporates a plurality of switches which includea movable contact |0|, a fixed contact |02, a xed contact |03, a movablecontact |04, a i'ixed contact |05, and a xed Contact |06.

A lead wire |01 extends from the battery 92 to a lower 'one of commonminus bars |08 to which a plurality of fuses |09 are connected, and alead wire ||0 extends from a common plus bar to said battery.

Lead wires designated |2 extend from individual fuses |09 to the lamps90 of each unit, and a lead wire denoted ||3 extends from said lamps 90of each unit to the switch arm 86 of the unit. Lead wires |4 extend fromeach xed contact 89 to each fixed contact 85, and lead wires ||5 extendfrom each switch arm 84 to` each fixed contact |03. A lead wire ||6extends from each movable contact |04 to the common plus bar l. Saidcommon plus bar is grounded at ||1.

A lead wire ||8 attached to each lead wire ||2- extends to each magnet89, and a lead Wire ||9 connects each magnet with a magnet 11. A leadwire |20 extends from each lead wire ||2 to each magnet 83, a lead wire|2| extends from each magnet 83 to each movable contact |0I, and aleadwire |22 connects each xed contact |02 with each lead Wire H5. A leadwire |23 extends from each lead wire ||5 to each switch arm 18, and alead wire |24 extends from each fixed contact 19 to each lead wire H8. Alead wire |25 extends from each lead wire |23 to each switch arm 8l, anda lead wire |26 extends from each xed contact 82 to each lead wire |24.

Lead Wires |21 extend from the lower common minus bar |08 to each of thelamps 9|, and lead wires |28 extend from said lamps 9| to each xedcontact |09.

In the disclosure as made, the multiple alarm system includes a singleset of fuse alarm lamps |29 and a single fuse alarm gong |80. A leadwire |3| extends from the upper common minus bar |08 to the fuse alarmlamps |29 and the fuse alarm gong |30, and a lead wire |32 extends fromsaid fuse alarm lamps and gong to the common plus bar III.

Each of the individual alarm system units of the multiple alarm systemas so far described will function in about the manner as already setforth in connection with Figs. l to 5, except that in the multiple alarmsystem there is a single group of fuse alarm lamps |29 and a single fusealarm gong |30 which will, evidently, be caused to operate when any oneof the fuses |09 breaks. It might be here stated that each fuse |09 isof the telltale type, as best shown in Figs. 11, 13 and 18, tointerconnect the upper and lower bars |08 of the fuse panel whenever afuse breaks, the interconnection of said fuse panel bars by the breakingof a fuse being accomplished in a Well known manner.

Each magnet11 of the relay A of Figs. 6, 7 and 13 is normally includedin a circuit leading from the battery 92 through the lead wire |01, thelower bar |08, the lead wire H2, the lead wire ||8, the magnet 80, thelead wire H9, said magnet 11, the lead wire |00, the lead wires 99 and91, the xed resistance 98 when employed, the lead wire 99, the variableresistance 98, the lead wire 95, and the switch 93 to ground.

As hereinbefore set forth, when each unit is installed, the variableresistance 94 is adjusted until a predetermined current flow is recordedon a test meter. This current flow is sulicient to energize the magnet11 of the unit to cause it to attract its armature 18 to thus hold themembers 18 and 19 apart, but is insufficient to energize the magnet 80to cause this magnet to attract its armature 8|. Thus, the members 8|and 82 will normally remain apart, as will also the members 84 and 85,the members 88. and 80, and the members 81 and 88. That is to say, therelay B of each unit is so adjusted or constructed that it will notoperate on the current ilow that is requred to operate the relay A.Thus, each relay B remains in normal position at all times except wheneither or both of the line wires 90 and 91 become grounded to cause theline to have less resistance than that in the normal circuit through themagnets 80 and 11 of a unit.

' Grounding of a line wire 90 or 91, or both, of

Vengages the fixed contact 19.

lead wire |22, the lead wire H5, the lead wire |23, and the lead wire|25 to the member 8|, thence through said members 8| and 82 to thecorresponding lead wire |20, and thence through the lead wires |29 andH6, the contact bar and the lead wire ||0 back to the battery.

Upon the breaking of the circuit through the relay A of a unit, or uponlessening the normal current through the magnet 11 of a unit, as alreadyhereinbefore set forth, the corresponding armature 18 is released fromsaid magnet 11 and Engagement of the members 18 and 19 with each othercompletes a circuit through the magnet 88, said circuit be ing tracedfrom the battery 92 through the lead wire |01, the lower bar |08, thecorresponding lead wire H2, and the corresponding lead Wire |20 to saidmagnet 83, thence through the corresponding lead wire |2| to thecorresponding movable contact ||l|, thence through the correspondingfixed contact |02, the lead wire |22, the lead wire ||5, and the leadWire |23 to the member 18, thence through said members 18 and 19 to thecorresponding lead wire |29, and thence through the lead wire H6, thecontact bar IH, and the lead wire ||0 back to the battery.

Energization of the magnet 93 of a unit, either by engagement of themembers 18 and 19 or the members 8| and 82 with each other, causes thearmatures 84 and 89, 81 to be attracted. The armature 811 when'attractedengages the xed contact 85, and the armatures 88, 81 when attractedengage the fixed contacts 88, 89, respectively. The members 85 and 81,while connected to move together, are insulated from each other.

When the members 8d and 85 and the members 80 and 88 of a unit are inengagement, a circuit is completed through the corresponding alarmsignal lamps 90, said circuit being traced from the battery 92, throughthe lead wire |01, the lower bar |98, and the corresponding lead wire||2 to said signal lamps 90, thence through the correspending lead wire|3 and said members 80 and 88 to the lead wire M, thence through themembers 85 and 80 and the corresponding lead wire ||5 to the xed contact|03, and thence through the corresponding movable contact |00, the leadwire I6, the contact bar and the lead wire H0 back to the battery. Thus,whenever a magnet 83 is energized, the signals 90 of the correspondingunit are made discernible. Said magnet 83 of a unit will be energizedeither when a line wire of said untbecomes broken, or when a line wireof said unit becomes grounded.

The magnet 09 of each unit will, naturally, when once energized, remainenergized as long as the contacts |0i, |02 and |03, |04, respectively,remain in engagement, a holding circuit for each magnet 88 being tracedfrom the battery 92 through the lead wire |01, the lower bar |08, thelead wire' l E2 and the lead wire |20 to said magnet 83, thence throughthe lead wire |2| to the members |8| and |02 of the unit, thence throughthelead wire 4|22 and the members |03 and |04 of the unit to the leadwire M6, and thence through said lead wire H0, the contact bar ||I, andthe lead wire ||0 back to the battery.

The contacts |0|, |02, |03, |00, |05 and |06 together constitute a unitwherein the contacts i9! and |02 are normally in engagement, theoontacts |03 and |09 are normally in engagement, and the contacts |05and |08 are normally out of engagement with the contact |00. Thecontacts |02 and |03 are connected with each other by a lead wire |22.The unit including said contacts is adapted to be manipulated fromnormal position to position causing the contacts l| and |02 to bedisengaged, the contacts |03 and |04 to be disengaged, and the contact|04 to be engaged with both of the contacts |05 and |05.

Upon the separation of the contacts IBI, |02 and 03, |04 of a unit, theholding circuit through the magnet 85 is broken. If at this time thenormal circuits through relays A and B of said unit are restored tocause the corresponding members 18, 19 and 8|, 82 to be separated, thecircuit through said magnet 83 will be broken, and the armatures 04, 85and 81 will move from their positions or" being attracted by said magnet83 to their non-attracted positions.

Upon the separating of the contacts |0|, |92 and |03, |04, the circuitsthrough the signals 90 will obviously become broken.

Upon the engagement of the contacts E53-4 and |05 of a unit with eachother, a circuit will be completed through the trouble and restorersignal 9| of said unit, said circuit being traced from the battery 92through the lead wire |01, the lower bar |08 and the lead wire |21 tosaid trouble and restorer signal, thence through the lead wire |28 andsaid contacts Y|05 and |04 to the lead wire H5, and thence through saidlead wire H6, the bar i and the lead wire l0 back to the battery. Thus,the trouble and restorer signal 9| of a unit will be made discernible,and will remain discernible, as long as the contacts |04 and |05 are inengagement. It will be apparent that upon restoration of the contactslili, |92, |03, |54, |05 and |05 to their normal positions, as shown inFigs. 6 and '7, the corresponding trouble and restorer signal will bemade non-discernible, and the corresponding alarm signals 90 will remainnon-discernible provided the corresponding relays A, B and C arenormally positioned. But, should there be a line wire of the unit eitherbroken or grounded, the alarm signals 90 or the unit will become againdiscernible. As hereinbefore stated, when there is a condition otherthan normal or a unit, either the signals 90 cr the signal 9| of theunit will remain discernible, depending upon the positions of thecontacts |0|, |02, |03, |04 and |05. It might be here remarked that theswitches 93 may be of approximately the same construction as theswitches 43. It will be evident that the 1ocation to be protected caninclude any preferred number of switches 93, all connected in series, asshown in Figs. 6 and 1.

In addition to the parts already described, the multiple alarm systemincludes a single gong |33 adapted to be actuated each time any oneofthe lamps 3|' is lighted. Also, the multiple alarm system includes asupervisors lamp |34 and a supervisors gong |35 which are actuated wheniever the gong |33 is actuated. Also, the multiple alarm system includesa supervisors general alarm lamp |35 and general alarm gong |31 whichare actuated whenever the lamps 90 of any one of the individual units ofthe multiple alarm system are lighted. Also, the multiple alarm systemincludes a single master alarm lamp |30 and a single master alarm gong|39 which are actuated whenever the lamps 90 of any one of theindividual units are lighted. Also, the multiple alarm system includes aplurality of pilot lamps, designated |49, desirably incorporating asingle pilot lamp for, say, the lamps 90 of five units, more or less,the purpose of the pilot lamps being a safety measure, so that 75 ifboth lamps 90 of a unit should be burnt out,

the lighted pilot lamp narrows the discovery of the trouble down toa'group of lamps.

The multiple alarm system includes relays D and E for controlling thesignals |33, |34 and |35, and relays F, G, H and I for controlling thesignals |36, |31, |38, |39 and |40.

The relay D consists of a magnet |4| having a pivoted armature |42comprising a movable switch arm of a switch including a fixed contact|43. The relay E consists of a magnet |44 hav-` ing a pivoted armature|45 at one of its ends comprising a movable switch arm of a switchincluding a fixed contact |45, and having a pivoted armature |41 at itsother end comprising a movable switch arm of a switch including a xedcontact |48.

A lead wire |49 extends from the lower bar |08 to the magnet |4|, and alead wire |50 extends from said magnet |4| to a common point |5| andhere joins lead wires |52, one leading to each fixed contact |05.

A lead wire |53 connects the lead Wire |49 with the contact |43, a leadwire |54 extends from the movable switch arm |42 to the magnet |44, anda lead wire |55 extends from said magnet |44 to the bar A lead wire |55extends from the lead Wire |49 to the contacts |46 and |48, a lead wire|51 extends from the movable switch arm 41 to the signal |33, and a leadwire |53 extends from said signal |33 to the bar A lead Wire |59 eX-tends from the movable switch arm |45 to the signals |34 and |35, and alead wire |50 extends from said signals |34 and |35 to said bar A leadwire |5| extends from the lead wire |3| to the lead wire |59.

It will be evident that when the contacts |04 and |05 of any unit are inengagement, a circuit will be completed through the magnet |4| of therelay D, said circuit being traced from the battery 92 through the leadwire |01 to the lower bar |03, thence through the lead wire |49 to saidmagnet |4|, thence through the lead Wire 50 to the appropriate lead wire|52, thence through the contacts |05 and |04 which are in engagement,and thence through the corresponding lead wire IIB, the bar and the leadwire ||0 back to the battery.

Energization of the magnet |4| attracts the armature I 42 and causes themembers |42 and |43 to engage each other.

When said members |42 and |43 are in engagement, a circuit is completedthrough the magnet |44, said circuit being traced from the battery 92through the lead wire |01 to the lower bar |08, thence through the leadwire |49 and the lead wire |53 to the fixed contact |43, thence throughthe members 43 and 42 and the lead wire |54 to said magnet |44, thencethrough said magnet, and thence through the lead wire |55, the bar andthe lead Wire ||0 back to the battery.

Energization of the magnet |44 attracts both of the armatures |45 and|41 to cause the members |45 and |46 and the members |41 and |48,respectively, to engage each other.

When the members |41 and |48V are in engagement, a circuit is completedthrough the signal |33, said circuit being traced from the bat- 525 |34and |35 to cease their operations.

thence through the Ilead wire |58, the bar and the lead wire back to thebattery.

When the members |45 and |46 are in engagement, a circuit is completedthrough the signals |34 and |35, said circuit being traced from thebattery 92 through the lead wire |01 to the lower bar |08, thencethrough the lead wire |49 and the lead wire |56 to the xed contact |46,thence through said members |46 and |45 to the lead wire |59, thencethrough said signals |34 and |35, and thence through the lead wire |60,the bar and the lead wire H0 back to the battery.

It will be evident that the magnet |4| will be 15 energized whenever thecontacts |04 and |05 are in engagement, and that energization of saidmagnet |4| will, in turn, energize the magnet |44 to attract thearmatures |45 and |41 to thus cause the signals |33, |34 and |35 to beactuated when- 20 ever the contacts |04 and |05 are brought intoengagement. Obviously, the breaking of engagement between said contacts|84 and |05 will deenergize the magnet |4|, to thus cause the magnet |44to be de-energized and said signals |33,

Said signals |33, |34 and |35 will, however, remain operative as long asthe contacts |04 and |85 are in engagement. That is to say, the signals|33, |34 and |35 will be operated in the system in precisely '30 thesame manner as any onel of the signals 9| is operated.

It will be evident that the signals |34 and |35 will be actuatedwhenever the fuse alarm signals |29 and |30 are actuated, a circuitthrough said signals |34 and |35 being completed when ani7 fuse |09breaks, said circuit being traced from the battery 92 through the leadwire |01 to the broken fuse, thence through the lead Wire |8| to thelead wire |6|, thence through the lead wires |8| and 40 |59 to saidsignals ylas and ist, and theme through the lead wire |60, the bar andthe lead wire H0 `back to the battery. The signals |36, |31, |38, |39and |48 are each V operated whenever the alarm designating signals 4" 90of a unit are operated, and all of said signals |36, |31, |38, |39 and|40 are made inoperative when all of the signals 90 are madeinoperative.

The relay F consists ofA a magnet |62 having a pivoted armature |53 atone of its ends which constitutes a movable switch arm of a switchincluding a xed contact |64, and having at its other end a pivotedarmature |65 which constitutes a movable switch arm of a switchincluding a ixed contact |66.

The relay G consists of a magnet |61 having a pivoted armature |68 atone of its ends which constitutes a movable switch arm of a switchincluding a xed contact |69, and having at its G0 other end a pivotedarmature |18 which constitutes a movable switch arm of a switchincluding a xed contact |1|.

The relay H consists of a magnet |12 having apivotedarmature |13 at oneof its ends which 5,-, constitutes a movable switch arm of a switchincluding a fixed Contact |14, and having at its other end a compoundpivoted armature including bars and |16 which constitute movable switcharms of switches including fixed contacts T() |11 and |18.

The relay I consists of a magnet |19'having a pivoted armature |89 atone of its which constitutes a movable switch arm of a switch includinga iixedl contact |8|, and having at its other end a pivoted armature |82which constitacts 89 to the lead wire ||6.

tutes a movable switch arm of a switch including a xed contact |83.

A lead wire |84 extends from the lower bar |89 to the magnet |52, a leadwire |85 extends from said magnet |62 to the switch arm |16 and a leadwire |86 extends from the switch arm |18to the bar Lead wires |81 extendfrom the lead wire |84 to the signals |36 and |31, and a lead wire |88extends from said signals |36 and |31 to the contact |64. A lead wire|89 extends from the lead wire |85 to the contact |65, and a lead wire|90 extends from the contact |66 to the bar A lead wire 9| connects theswitch arm |63 with the lead wire |85. A lead wire |92 extends from thelower bar |08 to the switch arm |13, a lead wire |93 extends from thexed contact |14 to the magnet |61, and a lead wire |94 extends from saidmagnet |51 to the lead wire |86. An incoming 110 volt lead Wire |95extends to the signal lamp |38, a lead wire |96 extends from said signallamp |38 to the fixed contacts |63 and |1|, and a lead Wire |91 extendsbetween the incoming line and the switch arms |63 and |10.

A lead wire |98 extends from the lower bar |08 to the magnet |19, a leadwire |99 extends from said magnet |19 to a plurality of the switch arms81, and lead wires 200 extend from the fixed con- A lead wire 28|extends from the lead wire |98 to the switch arm |82, a lead Wire 202extends from the xed contact |83 to the signal |40, and a lead wire 203extends from said signal |40 to the bar A lead wire 204 extends from thelead wire |98 to the switch arm |80, and a lead wire 205 extends fromthe xed contact |8| to the magnet |12. A lead wire 200 extends from thelead wire |92 to the signal |39, a lead wire 281 extends from saidsignal |39 to the fixed contact |11, and a lead wire 208 extends fromthe movable contact |15 to the lead wire |86.

When the magnet 83 of any one of the indin vidual units of the alarmsystem is energized to attract the armature 86 to bring the members 91and 89 into engagement, a circuit is completed through the correspondingmagnet |19, said circuit being traced from the battery 92 through thelead wire |01 to the lower bar 88, thence through the lead wire |98 tosaid magnet |19, thence through the lead wire |99 to the switch arm 81,thence through said members 81 and 89, and thence through the lead wire200, the lead wire i6, the bar and the lead wire i8 back to the battery.

Energization of the magnet |19 causes the armatures |80 and |82 to beattracted to thusbring the members |80 and |8I, and the members |82 and|83, respectively, into engagement. Engagement of the members |82 and 83with each other completes a circuit through the signal |48, said circuitbeing traced from the battery 32 through the lead wire |01, the lowerbar |03 and the lead wire |98 to the lead wire 20|, thence through thelead wire and the members |02 and |83 to said signal |40 and thencethrough the lead wire 283, the bar and the lead wire ||0 back to thebattery.

Engagement of the members |80 and |8| with each other completes acircuit through the magnet |12, said circuit being traced from thebattery 92 through the lead wire |81, the lower bar |08 and the leadwire |98 to the lead wire 204, thence through the lead wire 204, themembers |80 and 18| and the lead wire 285 to said magnet |12, and thencethrough the lead wire |86, the bar and the lead wire H0 back to thebattery.

Energization of the magnet |12 causes the contacts |13, |15 and |16 tobe attracted to thus bring the members |13, |14 and |15, |11 and |16,|18, respectively, into engagement.

Engagement of the members |13 and |14 with each other completes acircuit through the magnet |61, said circuit being traced from thebattery 92 through the lead wire |81, the lower bar |88 and the leadwire |92 to the switch arm |13, thence through said members |13 and |14and the lead wire |93 to the magnet |61, and thence through the leadwire |94, the lead wire |86, the bar and the bar ||0 back to thebattery. Energization of the magnet |61 attracts the armatures |68 and|10 to cause the members |68, |69 and |10, |1 I respectively, to beengaged with each other. Engagement of the members |68, |69 and |16, |1|completes the 110 Volt circuit through the signal |38, as will beapparent. The circuit of the 110 volt line will flow through both theswitch arm |68 and the switch arm |10.

Engagement of the members |15 and |11 with each other completes acircuit through the signal |39, said circuit being traced from thebattery 92 through the lead wireV |01, the lower bar |88 and the leadwire |92 to the lead wire 206, thence through said signal |39, thencethrough the lead wire 201, thence through said members |11 and |15, andthence through the lead wire 288, the lead wire |86, the barI and thelead wire ||0 back to the battery.

Engagement of the members |16 and |18 with each other completes acircuit through the magnet |82, said circuit being traced from themagnet 92 through the lead wire |81, the lower bar |08 and the lead wire|84 to said magnet |62, thence through the lead wire to the switch arm|18, thence through said members |16 and |18 to the lead wire |86, andthence through said lead wire |86, the bar and the lead wire i0 back tothe battery.

Energization of the magnet |62 will cause the armatures |63 and |65 tobe attracted to bring the members |63, |64 and |65, |66, respectively,into engagement. When the members |63 and |64 are in engagement, acircuit will be completed through the signals |36 and |31, said circuitbeing traced from the battery 92 through the lead wire |61 and thelower` bar |88 to the lead wire |84, thence through the lead wire |84and the lead wire |81 to said signals |36 and |31, thence through thelead wire |88 to the xed contact |64, thence through said members |64and |63 to the lead wire |9| thence through the lead wire |85 to theswitch arm |18, thence through said members |18 and |16 to the lead wire|86, and thence through the bar and the lead wire ||0 back to thebattery.

When the members |65 and |66 are in engagement a holding circuit for themagnet |62 is completed, said holding circuit being traced from thebattery 92 through the lead wire |81, the lower bar |88 and the leadwire |84 to said magnet |62, thence through the lead wires |85 and |86to said members |65 and |66, and thence through the lead wire |88, thebar and the lead wire |||i back to the battery.

It will be apparent that the magnet |19 will be energized when and onlywhen the lamps of a unit are lighted. Upon the breaking of the circuitthrough said lamps 90, the circuit will also be broken through themagnet |19. 'Ihis will, obviously, break the circuit through the signal|48 as well as through the magnet i 12. Upon the breaking of the circuitthrough the magnet |12 the circuit will, in turn, be broken through thesignal |38, through the magnet |61, and through the signal |38. Thus,when al1 of the lamps 80 are extinguished, all of the signals |38, |39and |40 will be inactive. But the signa-ls |36 and |31 having been oncemade operative will remain operative because of the holding circuit forthe magnet |62, as will be evident. This holding circuit is adapted tobe broken by manual operation of a hand switch 209 inserted in the leadwire |98. Thus, it will be seen, the supervisors general alarm lamp |36and general alarm gong |31 will remain active after the signals 90, |38,|39 and |40 are inactive, and until the supervisor has manipulated thehand switch 209 to break the holding circuit, after the supervisor hasgiven proper attention to the general alarm. That is to say, the signals90, |38, |39 and |40 are rendered inactive by manipulation of thecorresponding switch including the members |0| to |06, inclusive, whilethe signals |36 and |31 are rendered inactive by manipulation of thehand switch 209.

The lamp |38 will in practice be of relatively great strength, and forthis reason the volt power line is as disclosed connected up to keepthis lamp lighted. A substituted arrangement could, of course, beincorporated.

Attention is called to the fact that the supervisors signals |36 and |31could be a series of supervisors signals which could be situated at anyof a number of diierent locations.

The present multiple alarm system may be employed in connection with abroadcasting system when this may be desirable, by cutting in thebroadcasting system when an alarm is received in the multiple alarmsystem.

Referring more particularly to Figs. 6 and '7 of the drawings, Jrepresents a relay of the multiple alarm system adapted to actuate arelay K of a broadcasting system, the main features of whichbroadcasting system are not shown.

The relay J consists of a magnet 2|0 having a pivoted armature 2|| atone of its ends which constitutes a movable switch arm of a switchincluding a xed contact 2|2, and having at its other end a pivotedarmature 2|3 which constitutes a movable switch arm of a switchincluding a fixed contact 2 I4.

The relay K consists of a magnet 2|5 having a pivoted armature 2|6 atone of its ends which constitutes a movable switch arm of a switchincluding a xed contact 2|1, and having at its other end a pivotedarmature 2|8 which constitutes a movable switch arm of a switchincluding a xed contact 2|9.

A lead wire 220 extends from the lead Wire |93 to the magnet 2|0, and alead wire 22| extends from said magnet 2|0 to the lead wire |94. That isto say, the magnet 2|0 is connected in parallel with the magnet |61, sothat when said magnet |61 is energized, the magnet 2|0 is alsoenergized.

When said magnet 2|0 is energized, its armatures 2|| and 2|3 areattracted to cause the members 2||, 2|2 and 2|3, 2|4, respectively, tobe in engagement. When said members 2| 2|2 and 2|3, 2 I4 are inengagement, a circuit through the magnet 2|5 is completed, said circuitincluding a battery 222 and being traced from said battery through alead wire 223 to the contacts 2|2 and 2|3, thence by a lead wire 224from the switch arms 2|| and 2|3 to said magnet 2|5, and thence by alead Wire 225 to said battery 222,

Energization of the magnet 2|5 completes the -radio broadcastingcircuit, including lead wires 226 and 221, which lead wires areconnected together, as will be obvious, by engagement of the members2|6, 2|1 and 2|8, 2|9, respectively, the circuit including both of theswitch arms 2|6 and 2 I8.

'I'he relay K for the radio broadcasting system is in the radiobroadcasting system and it closes the circuit of the radio transmitter.The relay J for operating the relay K, by closing the circuit includingthe battery 222 and the magnet 2|5, is a part of the multiple alarmsystem. When the multiple alarm system is to be used without a radiotransmitting system, the relay J, together with its connections, will,of course, be omitted.

It will be apparent that the radio transmitting system circuit will beclosed immediately upon the reception of an alarm in the multiple alarmsystem, so that by the time an attendant of the multiple alarm systemhas noted the location originating the alarm and is ready to broadcastthe alarm, the radio transmitter is on the air and ready for thebroadcast. Thus, anywhere from ten seconds to a minute or more may besaved in dispatching a received alarm by radio.

In Figs. 8 to 22 there is disclosed in a general way, a structure forsetting upthe multiple alarm system for operation. Reference numeralswhich have been used in connection with the description of Figs. 6 and 7are applied at locations Where applicable upon Figs. 8 to 22.

In Figs. 8, 9 and 10 there is disclosed a cabinet 228 in which the partsof the multiple alarm system are suitably housed. In Figs. 10, l1, 12,13, 18, 19 and 20 specic features o-f construction of the cabinet 228and its appurtenances are lllustrated in detail.

With more specic reference to Figs. 8, 9, l0, l1, l2, 19 and 20,certainof the relays are shown housed in the upper part of the cabinet,and certain of said relays are shown housed in the lower part of thecabinet. The front wall of the cabinet provides a panel for the varioussignal lights 90 and 9|. The fuse alarms and the master alarm are shownsituated upon the upper left hand portion of the cabinet, as are alsoindicia denoting the battery meters, voltage, etc. Upon the panel theunits consisting of the contacts to |06, inclusive, are each designated229. In Fig. 11 one of theseunits is shown in detail. Said units 229 canbe constructed in any suitable manner, and can be conveniently mountedto be insulated from the panel after any preferred fashion.

There are upon the panel sign plates 230, one for the signals of eachunit, for designating the location whence an alarm emanates.

When the lamps 90 of a unit are lighted, the lamp |40 which includessaid unit will be lighted. Should the signal lamps 90 of a unit in aparticular instance be burnt out, the corresponding lamp |40 will,nevertheless, be lighted and each of the keys of the switches 229 of theunits parallelly connected with said lamp |40 which is lighted will bemanually turned to actuate said switches until the master alarm ceasesto function. The key which causes the alarm to restore will give thelocation of the originating alarm position, as will be evident.

In Figs. l1, 13 and 18 the fuse panel is shown in detail, and in Fig. 10said fuse panel is shown suitably mounted upon the panel of the cabinety 228. The various fuses are of the telltale type suitably supportedacross the upper and lower contact bars |08, and are of any constructionsuiting them to their purpose.

In Figs. 13, 14, 15, 16 and 17, as well as in Figs. 20 and 21, therelays A, B and C are shown in detail, and the manner in which saidrelays are mounted in the cabinet is illustrated. Suilce it to say thatall of' the relays which have been described may be suitably mounted insaid cabinet 228.

In Fig. 2l there is ydisclosed a separate cabinet;

23| in which the signals |34, |35, |36 and |31 are mounted. This cabinet23| is termed the supervisors cabinet and is designed for location in aroom spaced from the cabinet 220, the purpose of the signals housed inthe cabinet 23| being to inform a supervisor oiiother attendant of whatis happening at the cabinet 228 of the multiple alarm system. Thegeneral manner in which the signals |34, |35, |36 and |31 operate hasbeen set forth. As has been hereinbefore stated, the alarms |36 and |31in the supervisors cabinet will continue to operate after the alarms 90,|38, |39 and |46 have ceased to operate, and said alarms |36 and |31 canonly be made inoperative by manipulation of the switch 209, as forexample by the opening or releasing of an electrical lock by thesupervisor in such a manner that a key for said lock cannot be removedfrom the lock until the lock is afterwards restored to its normalposition. Thus is provided a method by which a key having a number tagthereon can be utilized by each supervisor, so that the failure to resetthe alarm can be traced back to a supervisor at fault.

As hereinbefore set forth the signals |34 and |35 in the supervisorscabinet are actuated and made inactive synchronously with a signal 9|.Thus, the supervisor can check on a line in trouble and have said linecared for in due course. Said signals |34 and |35 in the supervisorscabinet cannot be made inactive until all of the signals 9| and thesignal |33 are made inactive, as will be evident.

It will be noted that all of the circuits are fused singly so that theburning out of any fuse brings in an alarm on the main panel. The fuseused being of the mechanical telltale type, it is easily located tobereplaced by a new fuse.

It need not be remarked that all of the covers of the main cabinet andthe supervisors cabinet are locked closed to thus prevent tampering withany part of the mechanism by unauthorized persons.

In Fig. 22 there is disclosed any one of the alarm actuating mechanismsof Figs. l, 2, 4, 5, 6 and '1, the switch of said alarm actuatingmechanism being designated 93, and a case for the remainder of the partsof said mechanism being denoted 232. Said case 232 will, of course, belocked closed. Preferably, this case will be inaccessible, as will alsothe lead wire from the switch 93 to the case and to ground.

What I claim is:-

l. An alarm system comprising an alarm designating unit including aplurality of electric circuits, a signal included in an electric circuitof said alarm designating unit, said electric circuits additionallyincluding a holding electric circuit for said signal circuit andindependent of said signal, and a normally energized electric circuit,means at remote distance from said alarm designating unit grounding saidnormally energizedy circuit, said normally energized circuit including aline wire extending from said alarm designating unit and a resistanceadjacent the grounding means alfording a connection between said linewire and said grounding means, and a magnetically regulated electricswitch in said signal circuit and controlled by said normally energizedand said holding circuits.

2. An alarm system comprising an alarm designating unit including aplurality of electric circuits, a signal included in an electric circuitof said alarm Idesignating unit, said electric circuits additionallyincluding a holding electric circuit for said signal circuit andindependent of said signal, and a normally energized electric circuit,means at remote distance from said alarm designating unit grounding saidnormally energized circuit, said normally energized circuit including aline wire extending from said alarm designating unit and a resistanceadjacent the grounding means affording a connection between said linewire and said grounding means, magnetically actuated means in saidnormally energized circuit for closing said holding circuit either whena line wire of the system becomes broken or when a line wire of saidsystem becomes grounded, and an electric switch under the control ofsaid holding circuit for opening and closing said signal circuit.

3. An alarm system comprising an alarm designating unit including aplurality of electric circuits, a signal included in an electric circuitof said alarm designating unit, said electric circuits additionallyincluding a holding electric circuit for said signal circuit andindependent of said signal, and a normally energized electric circuit,

means at remote distance from said alarm des-A ignating unit groundingsaid normally energized circuit, said normally energized circuitincluding a line wire extending from said alarm designating unit and a.resistance adjacent the grounding means affording a connection betweensai-d line wire and said grounding means, magnetically actuated means insaid normally energized circuit for closing said holding circuit uponcessation of current flow in said line wire, magnetically actuated meansin said normally energized circuit for `closing said holding circuitupon alteration oi amount of current ow in said line wire, magneticallyactuated means in said holding circuit for maintaining the holdingcircuit in closed condition when once closed, and an electric switchunder the control of said holding circuit for opening and closing saidsignal circuit.

4. An alarm system comprising an alarm designating unit including aplurality of electric circuits, a signal included in an electric circuitof said alarm designating unit, said electric circuits additionallyincluding a holding electric circuit for said signal circuit andindependent of said signal, and a normally energized electric circuit,means at remote distance from said alarm designating unit grounding saidnormally energized circuit, said normally energized circuit including aline wire extending from said alarm designating unit and a resistanceadjacent the grounding means affording a connection between said linewire and said 4grounding means, magnetically actuated means for closingsaid holding circuit upon cessation of and upon alteration of amount ofcurrent ow in said line wire and for maintaining the holding circuit inclosed condition when once closed, and an electric switch under thecontrol of said holding circuit for closing and opening said signalcircuit.

5. An alarm'system comprising an alarm designating unit including aplurality of electric circuits, an ordinary signal included in anelectric circuit of said alarm designating unit, a special signalincluded in an electric circuit of said alarm designating unit, saidelectric circuits additionally including a holding electric circuit forsaid ordinary signal and special signal circuits, said hol-ding electriccircuit being independent of said signal, and a normally energizedelectric circuit, means at remote distance from said alarm designatingunit grounding said normally energized circuit, said normally energizedcircuit including a line wire extending from said alarm designating unitand a resistance adjacent` the grounding means affording a connection.between `said line wire and said grounding means, a magneticallyregulated electric switch in said ordinary signal circuit, and amagnetically regulated electric switch in said special signal circuit,said electric switches being controlled by said normally energized andsaid holding circuits.

6. An alarm system comprising an alarm designating unit including aplurality of electric circuits, an ordinary signal included in anelectric circuit of said alarm designating unit, a special signalincluded in an electric circuit of said alarm designating unit, saidelectric circuits additionally including a holding electric circuit forsaid ordinary signal and special signal circuits, said holding electriccircuit being independent oi said signal, and a normally energizedelectric circuit, means at remote distance from said alarm designatingunit grounding said normally energized circuit, said normally energizedcircuit including a line wire extending from said alarm designating unitan-d a resistance adjacent the grounding means aiording a connectionbetween said line wire and said grounding means, magnetically actuatedmeans for closing said holding electric circuit upon cessation of andupon alteration of amount of current Iiow in said line wire and formaintaining the holding circuit in closed condition when once closed, anelectric switch under the control of said holding circuit for openingand closing said ordinary signal circuit, and an electric switch underthe control of said holding circuit or opening and closing said specialsignal circuit.

'7. An alarm system comprising an alarm designating unit including asignal circuit, a signal in said circuit, a holding electric circuit forsaid signal circuit, said holding electric circuit being independent ofsaid signal, and a normally energized electric circuit, means at remotedistance from. said alarm designating unit grounding said normallyenergized circuit, said normally energized circuit/including a line wireextending from said alarm designating unit and a resistance adjacent thegrounding means affordingv a connection between said line wire and saidgrounding means, means for closing said holding circuit upon cessationof and upon alteration of amount of current flow in said line wire andfor maintaining the holding circuit in closed condition when onceclosed, an electric switch under the control of said holding circuit foropening an-d closing said. signal circuit, and means for manuallyopening said hol-ding circuit.

HAROLD B. MILLER.

